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56 lines
1.6 KiB
Kotlin
56 lines
1.6 KiB
Kotlin
package eu.kanade.tachiyomi.util
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import java.util.*
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/**
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* This singleton is used to share some objects within the application, useful to communicate
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* different parts of the app.
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*
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* It stores the objects in a map using the type of the object as key, so that only one object per
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* class is stored at once.
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*/
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object SharedData {
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/**
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* Map where the objects are saved.
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*/
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val map = HashMap<Class<*>, Any>()
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/**
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* Publish an object to the shared data.
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*
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* @param data the object to put.
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*/
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fun <T : Any> put(data: T) {
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map.put(data.javaClass, data)
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}
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/**
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* Retrieves an object from the shared data.
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*
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* @param classType the class of the object to retrieve.
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* @return an object of type T or null if it's not found.
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*/
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@Suppress("UNCHECKED_CAST")
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fun <T : Any> get(classType: Class<T>) = map[classType] as? T
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/**
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* Removes an object from the shared data.
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*
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* @param classType the class of the object to remove.
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* @return the object removed, null otherwise.
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*/
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fun <T : Any> remove(classType: Class<T>) = get(classType)?.apply { map.remove(classType) }
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/**
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* Returns an object from the shared data or introduces a new one with the given function.
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*
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* @param classType the class of the object to retrieve.
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* @param fn the function to execute if it didn't find the object.
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* @return an object of type T.
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*/
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@Suppress("UNCHECKED_CAST")
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inline fun <T : Any> getOrPut(classType: Class<T>, fn: () -> T) = map.getOrPut(classType, fn) as T
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}
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